/Engine/Source/Editor/MovieSceneTools/Public/Constraints/MovieSceneConstraintChannelHelper.h
This will only set the value son channels with keys at the specified time, reusing tangent time etc.
template<typename ChannelType> static void SetTransformTimes ( const [TArrayView](API\Runtime\Core\Containers\TArrayView)< ChannelType * > & InChannels, const [TArray](API\Runtime\Core\Containers\TArray)< [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) > & Frames, const [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & Transforms )